15thc perception on swallowtail merlons?

[Koen G]

This one is late and may be irrelevant, but it's an interesting view nonetheless. The wall has goopy white stuff below the merlons, as if it has recently been repaired. From Carlo Crivelli's masterful Annunciation altarpiece, painted in 1486: You are not allowed to view links. Register or Login to view.

   

It was painted for the town of Ascoli Piceno, which seems to have had a troubled history, changing owners in the 15th century. 
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